delta p for merck HPLC column

[tarzan]

hi all
the CoA for merck lichrocart says something like this
===============
test results for toulene
k=1.9
N/m=82789
As=1.0
delta p=64 bar
=======================
what does this delta p stand for ...?

hoping to get some information ....

with best wishes

[Vlad Orlovsky]

usually back pressure observed with CoA mobile phase

[tarzan]

hi thanks for the quick reply
the CoA says 60 bar for 75:25 ACN water ..
but I get 90 bar ...??

what should i do ..?

bets wishes ...

[Vlad Orlovsky]

See how much back pressure you have without column. May be the difference comes from your system

[Gerhard Kratz]

An external manometer after the column will give you the exact pressure. Maybe the built in electronic pressure damper is not set properly!
Can be set by the service technician. Good luck.